It‘s been 236 years of interchangeable robots singing „America the Beautiful.“

It‘s obvious why schools have to do this – real history is dangerous. If the people in charge 50 years ago were horribly flawed, students might consider the possibility that the ones in charge now are too. But all people, especially the kind that spend their lives seeking power, are horribly flawed, and its their flaws that make them human and interesting. So schools know they‘re being constantly monitored by whoever‘s currently at the top of the pyramid in case they slip up and accidentally let something interesting into the curriculum.